Scheduled for May 2 at the National Yoyogi Stadium in Tokyo, Japan, the event will also feature the second round of the organization's featherweight grand prix.

Ribeiro vs. Yamamiya joins Leo Santos vs. Kazunori Yokota as the only officially announced bouts on the card.

The 28-year-old Ribeiro is an amazingly well-decorated Brazilian jiu-jitsu world champion who is widely considered to be among the world's top grapplers. The Brazilian made his professional MMA debut with a gutsy, third-round TKO over Takashi Sugiura in September 2008 at "Sengoku Fifth Battle."